A ballroom tragedy

Opens on a set of a sitting room, apparently off a ballroom where dancers occasionally can be glimpsed through a curtained entrance stage right. Near the entrance, a young couple in formal attire talk--perhaps angrily--as another couple exit the dancing. The second man introduces his companion--a striking woman in a risqué white gown with a low-cut bodice and bare shoulders--to the other man and then reenters the dance hall. The young man apparently excues his female companion, who is plainer in comparison with the new arrival, and invites the woman in white to join him on a settee. The two talk closely and affectionately, as the spurned woman returns with a knife in her hand and hides in the curtain behind the sitting couple. When the two kiss, she reaches out and stabs her rival in the back. The injured woman jumps up in pain and then collapses on the floor, apparently dead. The murderess runs away as the young man rushes to hold the fallen woman.